API MPMS 7.2-2018 pdf download

API MPMS 7.2-2018 pdf download

API MPMS 7.2-2018 pdf download.Manual of Petroleum Measurement Standards Chapter 7—Temperature Determination Section 2—Portable Electronic Thermometers.
3.1.3 temperature discrimination The ability to sense and record the actual temperature of a liquid to the specified temperature increments. 3.1.4 thermometer A device that measures temperature using any of a variety of different principles. A thermometer has two important components: a temperature sensor in which some physical change occurs that is dependent on temperature, and some means of indicating and/or transmitting this physical change as a value. 3.1.5 temperature sensor A part of a thermometer in which some physical change occurs with temperature and converts this change into a value on a scale (e.g. the scale on a liquid-in-glass thermometer, a digital device that displays a unit of measure). 3.1.6 portable electronic thermometer (PET) A PET is a subset of class “D” or better digital thermometer (per ASTM E 2877) with features specifically required to perform static measurements in the petroleum and petrochemical industry. These include, but are not limited to, the following features: — probe and cable with a length for the application and readout device;
— made of materials resistant to product characteristics and temperature being measured; — intrinsic safety classification. 3.1.7 digital contact thermometer (DCT) (referred to as digital thermometer) An electronic device (per ASTM E 2877) consisting of a digital display and associated temperature sensing probe. 3.1.8 reference standard thermometer National Metrology Institute (NMI) traceable thermometer of suitable resolution and accuracy. 4 General Precautions 4.1 Safety Safety shall be considered for the specification, installation, and operation of all equipment. Refer to API RP 500 and NFPA 70 for guidance. When loading liquids that can accumulate static charges, refer to the precautions described in the International Safety Guide for Oil Tankers and Terminals, Safety of Life at Sea (ISGOTT), API MPMS Ch. 3, and API RP 2003. Safety and material compatibility precautions should be taken into consideration when using PETs. The manufacturer recommendations on the use of the equipment should be followed. Users of PETs should comply with all applicable codes, regulations, API standards, and the applicable national electrical safety standards (e.g. NFPA 70 in the U.S.). All PETs used in marine service should be specified in accordance with the appropriate national or international (IMO, USCG, IEC, ISGOTT, ISO, etc.) marine electrical safety standards. PETs shall be certified for use in the hazardous area classification appropriate to their use. 4.2 Mercury Warning Warning—Mercury has been designated by the EPA and many state agencies as a hazardous material that can cause central nervous system, kidney, and liver damage. Mercury, or its vapor, may be hazardous to health and corrosive to materials. Caution should be taken when handling mercury and products that contain mercury. See the applicable product safety data sheet (SDS) for details and the EPA website (www.epa.gov/mercury/faq.htm) for additional information.
5 Units of Measure For custody transfer, the means of temperature determination should be agreed to among the parties involved. Temperatures referenced in this document are those defined by the International Temperature Scale of 1990 (ITS-90). Temperatures may be measured and expressed in degrees Celsius or in degrees Fahrenheit. This standard presents both SI and USC units, and either may be implemented. The presentations of both units are for the convenience of the user, and are not necessarily exact conversions. The units of implementation are typically determined by contract, regulatory requirement, the manufacturer, or the user calibration program. Once a system of units is chosen for a given application, they should not be arbitrarily changed. (See API MPMS Ch. 15.) 6 Equipment and Design Requirements A wide range of portable electronic thermometers are available that are designed to take spot temperatures at any location within a tank that is accessible from the available gauging access point(s). The PET may be used as a precise measuring device for measuring the temperature of petroleum or petroleum product. It may also be used as reference thermometer for verifying the calibration of other (permanently installed) temperature-measuring devices.

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